Duplex attachment for a printer



FIG. 1 is a top plan view of a duplex attachment for a printer showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top, front right side perspective view thereof. 

The ornamental design for a duplex attachment for a printer, as shown and described. 